As you know, president obama has strongly defended the surveillance program, saying it strikes the right balance between freedom and keeping this nation safe from terror. The obama administration has said the person at the center of this leak would be prosecuted. What are they saying now? I want to bring in abc's reena ninan at the white house tonight. Reena, good evening. Reporter: Good evening, david. When the leaker's identity became public this afternoon, president obama was on a plane from california. Even before snowden went public, white house officials said the focus had been trying to determine the damage this has done to national security. That review is still ongoing. Snowden has admitted he has more classified information, details, he chose not to reveal. A national security source tells me this evening that there is another concern, that others in intelligence might be motivated to do the same. Today, the cia had no official comment.

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